20870033 has 4 divisors (see below), whose sum is σ = 22097700. Its totient is φ = 19642368.

The previous prime is 20870023. The next prime is 20870051. The reversal of 20870033 is 33007802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15816529 + 5053504 = 3977^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 20870033 - 2¹² = 20865937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20869990 and 20870008.

It is not an unprimeable number, because it can be changed into a prime (20870023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613808 + ... + 613841.

It is an arithmetic number, because the mean of its divisors is an integer number (5524425).

Almost surely, 2^20870033 is an apocalyptic number.

It is an amenable number.

20870033 is a deficient number, since it is larger than the sum of its proper divisors (1227667).

20870033 is a wasteful number, since it uses less digits than its factorization.

20870033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227666.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20870033 is about 4568.3731239906. The cubic root of 20870033 is about 275.3220821318.

Adding to 20870033 its reverse (33007802), we get a palindrome (53877835).

The spelling of 20870033 in words is "twenty million, eight hundred seventy thousand, thirty-three".